Azure Blob Access Tier for Infrequent Immediate Access
A media archive contains video files that are accessed only a few times per year, but they must remain online and readable immediately whenever an investigator requests them. Which blob access tier should the administrator choose to minimize storage cost?
Quick Answer
The answer is the Cold tier. This is the correct choice because it provides online, immediately readable storage for data accessed only a few times per year, while offering lower storage costs than the Cool tier. Unlike the Archive tier, Cold tier data does not require a rehydration delay, ensuring instant access for investigators who need to view video files on demand. On the AZ-104 exam, this scenario tests your understanding of the trade-off between access latency and cost across the four blob access tiers: Hot, Cool, Cold, and Archive. A common trap is choosing Archive to save the most money, but forgetting that Archive requires a rehydration process that can take hours, violating the “immediate access” requirement. The key distinction is that Cold tier is the lowest-cost online tier—meaning data is always available without delay. For a memory tip, think of “Cold” as the “cooler but still ready” option: it’s colder than Cool in cost, but not frozen like Archive.
⚠ Common exam trap
Many candidates confuse the Archive tier's 'immediate online access' with its actual requirement for rehydration, leading them to choose Archive for cost savings without considering the access latency constraint.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Cold
The Cold tier is the correct choice because it provides online, immediately readable storage for data accessed only a few times per year, while offering lower storage costs than the Cool tier. Unlike the Archive tier, Cold tier data does not require a rehydration delay, ensuring instant access for investigators.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Hot
Why it's wrong here
Hot is designed for frequent access and usually costs more to store than colder tiers.
When this WOULD be correct
A question where data is accessed frequently (e.g., multiple times per day or week) and requires low latency, such as a live video streaming service or a real-time analytics platform. The Hot tier minimizes access costs and provides the best performance for frequent reads.
- ✗
Cool
Why it's wrong here
Cool is suitable for infrequent access, but Cold is generally better for even less frequent reads.
When this WOULD be correct
An administrator needs to store data that is accessed about once a month, with immediate retrieval required. The Cool tier offers lower storage cost than Hot while still providing low-latency access for monthly access patterns.
- ✓
Cold
Why this is correct
Cold is intended for very infrequently accessed data that still needs to stay online and readable immediately.
- ✗
Archive
Why it's wrong here
Archive is offline and would require rehydration before the investigators could read the files.
When this WOULD be correct
A question where data is rarely accessed (e.g., once per year) and immediate read access is not required, such as long-term backup or compliance archives where retrieval latency of up to 15 hours is acceptable.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-104 exam frequently reuses these exact scenarios with slightly different constraints.
✓ColdCorrect answer▾
Why this is correct
Cold is intended for very infrequently accessed data that still needs to stay online and readable immediately.
✗HotWrong answer — click to see why▾
Why this is wrong here
The Hot tier is designed for frequently accessed data with high availability and low access latency, but it has the highest storage cost. For data accessed only a few times per year, the Hot tier would be unnecessarily expensive.
★ When this WOULD be the correct answer
A question where data is accessed frequently (e.g., multiple times per day or week) and requires low latency, such as a live video streaming service or a real-time analytics platform. The Hot tier minimizes access costs and provides the best performance for frequent reads.
Why candidates choose this
Candidates may think 'Hot' is always the best for immediate readability, overlooking that storage cost is the primary concern and that Cold tier also offers immediate readability at lower cost.
✗CoolWrong answer — click to see why▾
Why this is wrong here
The Cool tier is designed for data accessed infrequently (30+ days) but still requires lower latency than Cold. However, the question specifies access only a few times per year, which aligns better with Cold tier's longer access interval and lower cost, making Cool more expensive than necessary.
★ When this WOULD be the correct answer
An administrator needs to store data that is accessed about once a month, with immediate retrieval required. The Cool tier offers lower storage cost than Hot while still providing low-latency access for monthly access patterns.
Why candidates choose this
Candidates may confuse 'infrequent access' with 'few times per year' and choose Cool as a middle ground, not realizing Cold tier is specifically optimized for yearly access patterns with even lower cost.
✗ArchiveWrong answer — click to see why▾
Why this is wrong here
The Archive tier has the lowest storage cost but requires hours to rehydrate data before reading, violating the requirement that files remain 'readable immediately' upon request.
★ When this WOULD be the correct answer
A question where data is rarely accessed (e.g., once per year) and immediate read access is not required, such as long-term backup or compliance archives where retrieval latency of up to 15 hours is acceptable.
Why candidates choose this
Candidates see 'accessed only a few times per year' and assume the cheapest tier (Archive) is best, overlooking the 'readable immediately' constraint that makes Cold the correct choice.
Analysis generated from the official AZ-104blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Quick reference
Azure Blob Storage Tier Comparison
| Tier | Storage Cost | Retrieval Cost | Latency | Use Case |
|---|---|---|---|---|
| Hot | Highest | Lowest | Immediate | Active data, frequent reads |
| Cool | Lower | Higher | Immediate | Data accessed < once / month |
| Cold | Lower still | Higher | Immediate | Data accessed < once / quarter |
| Archive | Lowest | Highest + rehydration delay | Hours | Long-term compliance retention |
Go deeper
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Key term
Blob
A blob is a large piece of unstructured data, like a photo or video, stored in the cloud with a unique identifier.
Key term
Cool tier
Cool tier is a low-cost, online-only storage access tier in Microsoft Azure Blob Storage designed for data that is infrequently accessed and stored for at least 30 days.
About these practice questions
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Same concept, more angles
2 more ways this is tested on AZ-104
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. You have a storage account that stores infrequently accessed data that must remain available immediately when requested. You need to minimize storage costs. Which access tier should you use?
medium- A.Premium
- B.Hot
- ✓ C.Cool
- D.Archive
Why C: The Cool access tier is designed for data that is infrequently accessed but still requires immediate availability when requested, offering lower storage costs than the Hot tier while maintaining low latency access. Since the data must remain available immediately, the Archive tier is unsuitable due to its multi-hour retrieval latency, and the Premium tier is optimized for high-performance scenarios, not cost minimization.
Variation 2. An archive of legal documents is accessed only a few times each month, but when someone needs a document it must open immediately without a rehydration wait. Which access tier should be used?
easy- A.Hot tier
- ✓ B.Cool tier
- C.Archive tier
- D.Geo-redundant storage (GRS)
Why B: The Cool tier is designed for data that is infrequently accessed but must be available immediately when needed, with a lower storage cost than Hot tier but higher access costs. Since the archive is accessed only a few times per month and requires instant retrieval without rehydration delay, Cool tier meets both requirements, whereas Archive tier would impose a rehydration wait of up to 15 hours.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This AZ-104 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-104 exam.